Stairway construction



April 1934- P. BATESON ET AL 1,954,722

STAIRWAY CONSTRUCTION Filed July 30 1932 J3 PaLLZ fia/ieson/ NNNNNNN R5 Patented Apr. 10, 1934 STAIRWAY CONSTRUCTION Paul Eateson and Herbert Bastow, Saylesville, R. I.

Application July 30, 1932, Serial No. 626,750

4 Claims.

wherein the component parts are interfitted when associated to provide a strong and durable construction.

In carrying out the invention we comprehend a stairway construction wherein the component parts are designed for interfitting association, so that they can be shipped knockdown and quickly and accurately assembled by an unskilled person, and without the use of nails or analogous fastening elements.

The nature and advantages of the invention 'will be better understood when the following detail description is read in connection with the accompanying drawing, the invention residing in the construction, combination and arrangement of parts as claimed.

In the drawing forming part of this application like numerals of reference indicate similar parts in the several views and wherein:

Figure 1 is a perspective view of a stairway constructed in accordance with the present in- 1 vention.

Figure 2 is a fragmentary vertical sectional view.

Figure 3 is a sectional view on line 3-3 of Figure 2.

Figure 4 is a fragmentary perspective View of one of the stringers.

While we have illustrated a stairway construction, the component parts of which are of reinforced concrete, we desire to have it understood that any other suitable material may be employed and the number of such parts employed, may be varied depending upon the desired size of the stairway.

The construction essentially embodies a pair of opposed stepped stringers 10, each of which may be provided with a panel 11 for ornamental purposes. The panel is molded in each stringer, and may be plain as illustrated, or provided with ornamental design. Each stringer is preferably of the construction illustrated in Figure 4, wherein it will be noted that each stringer is provided with a shallow horizontal groove 12 and a vertical groove 13 disposed immediately above and communicating with the horizontal groove 12.

These grooves of the respective stringers are arranged in alignment for a purpose to be hereinafter described, while each step of the stringer is provided with an inwardly directed rightangularly disposed extension 14 arranged immediately in advance of the vertical groove 13, and arranged to provide one wall of said groove. The outer edge of each step of each stringer is reduced to form a shoulder 15 adapted to cooperate with a shoulder 16 formed on the under side of the tread members 17.

Each tread member 17 is preferably reinforced by metallic rods 18 embedded therein as illustrated in Figure 2, and these tread members obviously repose upon the steps of the stringers 10. The rear longitudinal edge of each tread member is received by the adjacent horizontally aligned grooves 12 of the respective stringers, with the exception of the uppermost tread member, which is provided on its underside with a longitudinal strip 19 adapted to be received by notches or depressions 20 formed in each stringer. As each tread member is moved into its respective grooves 12, the shoulders 16 formed on the under side of the tread member are brought into contacting engagement with the shoulders 15 of the stringers. The upper face of each tread member, with the exception of the uppermost tread member, is provided with a longitudinal groove 21 located adjacent the rear edge of the member to accommodate the adjacent riser 22 as clearly illustrated in Figure 2. Manifestly, there is one of these risers arranged between the adjacent tread members 17, and the lower edge of each riser is fitted in the adjacent groove 21, while the opposed end edges of each riser are received by the aligned vertical grooves 13 of the respective stringers. Consequently when the risers 22 are arranged in position for use, the ends of the stringers are arranged behind the right-angularly disposed extensions 14 to provide a neat and finished appearance. Where a cement foundation is not provided for the stairway, we use concrete base elements 23 upon which the stringers repose, and the foremost riser 22 terminates flush with the lower edges of the stringers and also reposes upon the base elements 23.

By virtue of the construction illustrated and described, it will be manifest that the component parts of the stairway are designed for interfitting association, and when assembled provides a con struction which is both strong and. durable and very neat in appearance. The component parts can be shipped knockdown, and can be quickly and accurately assembled by any unskilled person, the parts being interchangeable, and should any one part become broken it could be easily replaced.

While it is believed that from the foregoing description the nature and advantages of the invention will be readily apparent, we desire to have it understood that we do not limit ourselves to what is herein illustrated or described and that such changes may be resorted to when desired as fall within the scope of what is claimed.

What is claimed is:

1. A knockdown stairway comprising spaced stringers having opposed horizontal grooves and vertically disposed grooves disposed entirely above said horizontal grooves adjacent corresponding ends thereof and communicating therewith, tread members supported by said stringers, each tread member having its rear edge received by one pair of said horizontal grooves and a groove formed in its upper surface adjacent said edge, and a riser supported between adjacent tread members and received by the aligned vertical groove of said stringers, and by the groove in one of said tread members.

2. A knockdown stairway comprising spaced stringers having opposed horizontal grooves and vertically disposed grooves wholly disposed above said horizontal grooves adjacent corresponding ends thereof and communicating with the latter, tread members supported by said stringers, each tread member having its rear edge received by one pair of horizontal grooves, and formed with a longitudinal groove in its upper surface adjacent said edge, a riser supported between adjacent tread members and received by the opposed vertical grooves of said stringers and the longitudinal groove of one of said tread members, and inwardly directed right-angularly disposed extensions formed on the stringers and disposed in advance of said risers.

3. A concrete knockdown stairway comprising spaced stringers having opposed horizontal grooves and vertical communicating grooves wholly disposed above the horizontal grooves adjacent corresponding ends thereof, tread members supported by said stringers, each tread member having its rear edge received by one pair of said horizontal grooves, and formed with a groove in its upper surface adjacent said edge, a riser supported between adjacent tread members and received by the opposed vertical grooves of said stringers and the grooves in one of said tread members, and inwardly directed right-angularly disposed extensions carried by said stringers and constituting one wall of each of said vertical grooves.

4. A knockdown stairway comprising spaced stringers having opposed horizontal and vertically disposed communicating grooves, a shoulder formed on each stringer immediately adjacent said grooves, tread members supported by said stringers, each tread member having its rear edge received by one pair of said horizontal grooves, shoulders formed on the under side of each tread member to engage the adjacent shoulders of said stringers, and a riser supported between adjacent tread members and having its opposed ends received by said vertical grooves of the stringers, and its lower edge interfitted with the adjacent tread members.

PAUL BATESON. HERBERT BASTOW. 

